Section  211.3695  Maximum True Vapor Pressure

"Maximum true vapor pressure" means the equilibrium partial pressure exerted by stored VOL at the temperature equal to the highest calendar-month average of the VOL storage temperature for VOLs stored above or below the ambient temperature or at the local maximum monthly average temperature of 75°F for the Chicago area as defined at 35 Ill. Adm. Code 218.100 or 79°F for the Metro-East area as defined at 35 Ill. Adm. Code 219.100 for VOLs stored at the ambient temperature, as determined:

a)         In accordance with methods described in American Petroleum Institute bulletin 2517, Evaporation Loss from External Floating Roof Tanks, incorporated by reference at 35 Ill. Adm. Code 218.112 and 219.112; or

b)         By ASTM Method D2879-83, incorporated by reference at 35 Ill. Adm. Code 218.112(a)(1) and 219.112(a)(1).

(Source:  Amended at 29 Ill. Reg. 8892, effective June 13, 2005)